Gary Dolan is a pedophile who molested Brian Cassidy when he was a boy amongst many other children for several decades during his lengthy career as a Little League coach.
The trauma of his abuse eventually led to one of his victims, Micah Fuller, committing suicide as an adult, which soon led the Special Victims Unit to Dolan after a connection with Cassidy was found in Dolan's past. It was unknown whether or not he was convicted, however it was likely he was. (SVU: "Facing Demons")